possibly outdated controls.defaults

[mathren]

Hello! I was looking into controls.default and found this (to me very interesting option):

      ! mass_depth_for_L_surf
      ! ~~~~~~~~~~~~~~~~~~~~~

      ! only if ``use_flux_limiting_with_dPrad_dm_form``

      ! ::

    mass_depth_for_L_surf = 0d0

However, searching the code base for mass_depth_for_L_surf or use_flux_limiting_with_Prad_dm_form, they seem to appear only in ctrls_io.f90. This + the name hinting at flux limited diffusion makes me think this is an old option that cannot be used anymore.

[evbauer]

Thanks! You're right, that's leftover and should be removed. Looks like this was most recently functional in release r12778. A few revisions later in the svn history shows:

------------------------------------------------------------------------
r12800 | bpaxton | 2020-03-11 14:59:58 -0400 (Wed, 11 Mar 2020) | 2 lines

remove flux limiter and porosity factor

@aurimontem might be able to offer some insight into how those options might have been used at one point and/or why they were removed?